Yes, you can stay overnight at Adolfo Suárez Madrid-Barajas (MAD) Airport in 2026, but the rules have become stricter recently. As of late 2025, airport authorities restricted overnight access to the public areas of the terminals (T1, T2, and T4) to passengers with a valid boarding pass for a flight departing within the next 24 hours. This measure was introduced to ensure safety and prevent the terminals from being used as informal shelters. For a comfortable stay, the best option is the "Air Rooms" located in Terminal 4, which offer private bedrooms and showers for 3–6 hour blocks or overnight stays. If you are sleeping in the public seating areas for free, Terminals 2 and 3 are often preferred by travelers because many of the seats do not have armrests, allowing you to lie flat. Security personnel do patrol throughout the night, so keep your documentation and belongings secure; the airport is open 24/7, and many cafes in T4 stay open to serve late-night transit passengers.